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Fencer Vulns
medium 5.3

CVE-2024-1681 json

Log Injection Vulnerability in corydolphin/flask-cors

published 2024-04-19 2 y ago modified 2026-09-10 1 mo ago also GHSA-84pr-m4jr-85g5 , PYSEC-2024-271 , EUVD-2024-1152

cvss
5.3
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 47%
public exploits
0
none known

Summary

corydolphin/flask-cors is vulnerable to log injection when the log level is set to debug. An attacker can inject fake log entries into the log file by sending a specially crafted GET request containing a CRLF sequence in the request path. This vulnerability allows attackers to corrupt log files, potentially covering tracks of other attacks, confusing log post-processing tools, and forging log entries. The issue is due to improper output neutralization for logs.

Patch / fix

  • pypi flask-cors 4.0.1
  • python-flask-cors Debian 12 3.0.10-2+deb12u1
  • python-flask-cors Debian 14, Debian 13 4.0.1-1

debian advisories DEBIAN-CVE-2024-1681

  • python-flask-cors Ubuntu 22.04 LTS 3.0.9-2ubuntu0.1
  • python-flask-cors Ubuntu Pro 20.04 LTS 3.0.8-2ubuntu0.1+esm1
  • python-flask-cors Ubuntu Pro 24.04 LTS 4.0.0-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2024-1681

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • python-Flask-Cors openSUSE Tumbleweed 6.0.2-1.2
  • python-Flask-Cors openSUSE Tumbleweed 4.0.1-1.1

opensuse advisories openSUSE-SU-2026:11990-1openSUSE-SU-2024:14293-1

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-2024-1681 updated cvss 5.3

python-flask-cors: improper output neutralization for logs

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

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
yes
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.57% chance of exploitation in the next 30 days, higher than 47% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • huntr.com https://huntr.com/bounties/25a7a0ba-9fa2-4777-acb6-03e5539bb644 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.0 5.3 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
OSV 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
GitHub 3.0 5.3 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected packages

ecosystem package affected fixed in
pypi flask-cors
<4.0.1
<=4.0.0
4.0.1

Affected products

  • corydolphin corydolphin/flask-cors
  • corydolphin flask-cors

Classification

Weakness
  • CWE-117 Improper Output Neutralization for Logs

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.