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Fencer Vulns
medium 5.3

CVE-2026-69153 json

PostCSS: incomplete fix of CVE-2026-45623 — attacker-controlled sourceMappingURL reads arbitrary .map files when `from` is unset

published 2026-08-03 3 mo ago modified 2026-09-10 1 mo ago also GHSA-fxqj-rqcc-2cmp , EUVD-2026-52373

cvss
5.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 39%
public exploits
0
none known

Summary

PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Prior to 8.5.19, if from is unset, an attacker can cause PreviousMap.loadFile() to read an unintended source-map file by supplying an absolute or directory-traversal sourceMappingURL. The resulting map’s sources and sourcesContent may then be exposed to the application. This issue is fixed in version 8.5.19.

Patch / fix

  • npm postcss 8.5.23
  • postcss postcss 8.5.23
  • node-postcss Debian 14 8.5.23+~cs10.2.23-1

debian advisories DEBIAN-CVE-2026-69153

  • receptor ansible automation platform inside 2.5, ansible automation platform developer 2.5, ansible automation platform 2.5 1.6.8-1.el8ap
  • receptor ansible automation platform inside 2.6, ansible automation platform inside 2.5, ansible automation platform developer 2.6 +3 more 1.6.8-1.el9ap
  • python3.12-sqlparse ansible automation platform developer 2.5, ansible automation platform 2.5 0.6.0-1.el8ap
  • python3.12-sqlparse ansible automation platform developer 2.6, ansible automation platform developer 2.5, ansible automation platform 2.6 +1 more 0.6.0-1.el9ap
  • python3.12-gitpython ansible automation platform 2.5 3.1.60-1.el8ap
  • python3.12-gitpython ansible automation platform 2.6, ansible automation platform 2.5 3.1.60-1.el9ap
  • automation-gateway-server ansible automation platform 2.5 2.5.20260923-1.el8ap
  • automation-gateway-server ansible automation platform 2.5 2.5.20260923-1.el9ap

red hat advisories RHSA-2026:71114RHSA-2026:71113RHSA-2026:68334RHSA-2026:57590RHSA-2026:50826RHSA-2026:50290

  • velociraptor openSUSE Tumbleweed 0.76.7.0.git145.b60ef1146-1.1
  • agama-web-ui openSUSE Tumbleweed 24+0.a836cced5-52.1

opensuse advisories openSUSE-SU-2026:12070-1openSUSE-SU-2026:11680-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-69153 updated cvss 5.3

postcss: PostCSS: Information disclosure via crafted sourceMappingURL

  • Red Hat Cryostat 4 postcss 8.5.12, grafana-infinity-datasource-npm 3.7.2_redhat_00002-1, cryostat-openshift-console-plugin-npm 4.2.0_redhat_00003-1 Red Hat Gatekeeper 3 gatekeeper/gatekeeper-rhel9 Red Hat Node HealthCheck Operator workload-availability/node-healthcheck-rhel9-operator, workload-availability/node-healthcheck-operator-bundle, workload-availability/node-healthcheck-must-gather-rhel9 Red Hat OpenShift Lightspeed openshift-lightspeed/lightspeed-console-plugin-rhel9, openshift-lightspeed/lightspeed-agentic-console-rhel9, openshift-lightspeed/lightspeed-console-plugin-419-rhel9, openshift-lightspeed/lightspeed-console-plugin-pf5-rhel9 Red Hat OpenShift Pipelines openshift-pipelines/pipelines-hub-ui-rhel8, openshift-pipelines/pipelines-hub-ui-rhel9, openshift-pipelines/pipelines-console-plugin-rhel8, openshift-pipelines/pipelines-console-plugin-rhel9, openshift-pipelines/pipelines-console-plugin-pf5-rhel9 Red Hat OpenShift Service Mesh 3 openshift-service-mesh/kiali-rhel9-operator, openshift-service-mesh/kiali-operator-bundle
    +23 more products
    Red Hat 3scale API Management Platform 2 3scale-amp2/system-rhel7 Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/volsync-rhel9, rhacm2/volsync-operator-bundle Red Hat AMQ Broker 7 postcss 8.5.12 Red Hat Ansible Automation Platform 2 automation-eda-controller 1.0.11-1.el9ap Red Hat build of Apache Camel - HawtIO 4 postcss 8.5.12 Red Hat build of Apache Camel for Spring Boot 4 postcss 8.5.12 Red Hat Build of Keycloak postcss 8.5.12 Red Hat Build of Podman Desktop rh-podman-desktop.git 1.1.0 Red Hat Connectivity Link 1 rhcl-1/rhcl-console-plugin-rhel9 Red Hat Data Grid 8 postcss 8.5.12 Red Hat Developer Hub 1 rhdh/rhdh-hub-rhel9, rhdh/red-hat-developer-hub-backstage-plugin-lightspeed, rhdh/red-hat-developer-hub-backstage-plugin-orchestrator, rhdh/red-hat-developer-hub-backstage-plugin-lightspeed-backend, rhdh/red-hat-developer-hub-backstage-plugin-orchestrator-backend, rhdh/red-hat-developer-hub-backstage-plugin-orchestrator-form-widgets, +2 more Red Hat Enterprise Linux 7 rhsm-gtk, python-syspurpose, subscription-manager, subscription-manager-gui, subscription-manager-rhsm, subscription-manager-cockpit, +5 more Red Hat Enterprise Linux 8 pcs, firefox, grafana, mozjs60, pcs-snmp, thunderbird, +16 more Red Hat Enterprise Linux 9 pcs, goose, firefox, grafana, pcs-snmp, firefox-x11, +7 more Red Hat Enterprise Linux 10 goose 1.23.2-2.el10_2, grafana 12.4.3-2.el10, firefox 140.13.0-1.el10_2, thunderbird 140.13.0-1.el10_2 Red Hat Enterprise Linux AI (RHEL AI) 3 rhelai3/bootc-cuda-rhel9, rhelai3/bootc-rocm-rhel9, rhelai3/bootc-gaudi-rhel9, rhelai3/disk-image-cuda-rhel9 Red Hat Hardened Images rust 1.97.1-2.hum1, jaeger 2.20.0-0.8.hum1, qt6-qtbase 6.11.1-5.hum1, qt5-qtbase 5.15.18-4.1.hum1, opentelemetry-collector 0.157.0-0.1.hum1, opentelemetry-collector-k8s 0.157.0-0.1.hum1, +1 more Red Hat OpenShift AI (RHOAI) rhoai/odh-mlflow-rhel9, rhoai/odh-workbench-codeserver-datascience-cpu-py312-rhel9 Red Hat OpenShift Container Platform 4 openshift4/ose-console, openshift4/ose-agent-installer-ui-rhel9 Red Hat OpenShift Container Platform 5 openshift5/ose-console-rhel9, openshift5/ose-agent-installer-ui-rhel9 Red Hat Openshift Data Foundation 4 odf4/ocs-client-console-rhel9, odf4/odf-multicluster-console-rhel9 Red Hat OpenShift Virtualization 4 container-native-virtualization/kubevirt-console-plugin-rhel9 Red Hat Satellite 6 nodejs-css-loader 6.11.0-1.el9sat, nodejs-sanitize-html 2.3.2-1.el9sat, satellite/iop-advisor-frontend-rhel9, satellite/iop-vulnerability-frontend-rhel9, satellite/iop-host-inventory-frontend-rhel9
    affected: workaround, no fix available “Pass map: false when invoking PostCSS to disable source map auto-loading. This prevents the path traversal from being triggered, though it removes source map support entirely.”
  • Red Hat Single Sign-On 7 postcss 8.5.12
    affected: workaround, no fix planned “Pass map: false when invoking PostCSS to disable source map auto-loading. This prevents the path traversal from being triggered, though it removes source map support entirely.”
  • Red Hat Trusted Artifact Signer rhtas/rhtas-console-ui-rhel9 Red Hat Secrets Management Console for Red Hat OpenShift external-secrets-management/console-plugin-rhel9
    affected: workaround, no fix available “Pass map: false when invoking PostCSS to disable source map auto-loading. This prevents the path traversal from being triggered, though it removes source map support entirely.”
  • Red Hat multicluster engine for Kubernetes 2.6 multicluster-engine/console-mce-rhel9 1787264250
    fixed: vendor fix “Pass map: false when invoking PostCSS to disable source map auto-loading. This prevents the path traversal from being triggered, though it removes source map support entirely.” RHSA-2026:59579
  • Red Hat multicluster engine for Kubernetes 2.8 multicluster-engine/console-mce-rhel9 1787259048
    fixed: vendor fix “Pass map: false when invoking PostCSS to disable source map auto-loading. This prevents the path traversal from being triggered, though it removes source map support entirely.” RHSA-2026:59558
  • Red Hat multicluster engine for Kubernetes 2.9 multicluster-engine/console-mce-rhel9 1787079359
    fixed: vendor fix “Pass map: false when invoking PostCSS to disable source map auto-loading. This prevents the path traversal from being triggered, though it removes source map support entirely.” RHSA-2026:59559
  • Red Hat multicluster engine for Kubernetes 2.11 multicluster-engine/console-mce-rhel9 1786911977
    fixed: vendor fix “Pass map: false when invoking PostCSS to disable source map auto-loading. This prevents the path traversal from being triggered, though it removes source map support entirely.” RHSA-2026:57194
  • Red Hat multicluster engine for Kubernetes 2.17 multicluster-engine/console-mce-rhel9 1786668856
    fixed: vendor fix “Pass map: false when invoking PostCSS to disable source map auto-loading. This prevents the path traversal from being triggered, though it removes source map support entirely.” RHSA-2026:59593
show 3 more
  • Red Hat Advanced Cluster Management for Kubernetes 2.11 rhacm2/console-rhel9 1787687062
    fixed: vendor fix “Pass map: false when invoking PostCSS to disable source map auto-loading. This prevents the path traversal from being triggered, though it removes source map support entirely.” RHSA-2026:60387
  • Red Hat Advanced Cluster Management for Kubernetes 2.13 rhacm2/console-rhel9 1787339249
    fixed: vendor fix “Pass map: false when invoking PostCSS to disable source map auto-loading. This prevents the path traversal from being triggered, though it removes source map support entirely.” RHSA-2026:60390
  • Red Hat Advanced Cluster Management for Kubernetes 2.14 rhacm2/console-rhel9 1787339248
    fixed: vendor fix “Pass map: false when invoking PostCSS to disable source map auto-loading. This prevents the path traversal from being triggered, though it removes source map support entirely.” RHSA-2026:60388

39 more fixed, 44 more not affected in the full advisory

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.45% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/postcss/postcss/security/advisories/GHSA-fxqj-rqcc-2cmp referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 6.3 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
CNA 4.0 6.3 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem package affected fixed in
npm postcss
<8.5.23
8.5.23

Affected products

  • postcss postcss

Classification

Weakness
  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.