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Fencer Vulns
medium 6.5

CVE-2025-56648 json

Parcel has an Origin Validation Error vulnerability

published 2025-09-17 13 mo ago modified 2026-06-17 4 mo ago also GHSA-qm9p-f9j5-w83w , EUVD-2025-29779

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 14%
public exploits
0
none known

Summary

npm parcel 2.0.0-alpha and before has an Origin Validation Error vulnerability. Malicious websites can send XMLHTTPRequests to the application's development server and read the response to steal source code when developers visit them.

Patch / fix

  • npm @parcel/reporter-dev-server 2.16.4

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-2025-56648 updated cvss 6.5

parcel: Parcel Origin Validation Error

  • Red Hat Enterprise Linux 9 rust, cargo, clippy, rustfmt, rust-gdb, rust-src, +8 more Red Hat Enterprise Linux 10 rust
    affected: workaround, no fix available “Fix deferred”
  • Red Hat JBoss Enterprise Application Platform 8 org.jboss.hal-hal-parent Red Hat JBoss Enterprise Application Platform Expansion Pack org.jboss.hal-hal-parent
    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
no
Technical impact
partial
Assessed
13 mo ago

Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 14% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • gist.github.com https://gist.github.com/R4356th/41f468def606b2406e36f7193f5322b8 referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/parcel-bundler/parcel/issues/10216 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
GitHub 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
npm @parcel/reporter-dev-server
>=1.6.1, <2.16.4
2.16.4

Classification

Weakness

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.