6.3

CVE-2026-69153: PostCSS: incomplete fix of CVE-2026-45623 — attacker-controlled sourceMappingURL reads arbitrary .map files when `from` is unset

Analyzed
AliasesRHSA-2026:50070UBUNTU-CVE-2026-69153DEBIAN-CVE-2026-69153
Published 03-08-2026Last modified 03-08-2026

Vulnerability summary

CVE-2026-69153 is a medium (CVSS 6.3) vulnerability in postcss. EPSS estimates a 0.45% chance of exploitation in the next 30 days, higher than 39.2% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Routine

Not severe (CVSS 6.3, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
6.3/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.45%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 10 · Related 3
OPENSUSE-SU-2026:11680-1OPENSUSE-SU-2026:12070-1RHSA-2026:50079RHSA-2026:50287RHSA-2026:50290RHSA-2026:50826

Timeline

  1. 03-08-2026
    PublishedVulnerability first disclosed.
  2. 03-08-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

10 scores · 8 sources · 2 versions

EPSS trend

Probability

0.45%

Chance of exploitation in the next 30 days

Percentile

39%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.45% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found
  • githubUnverified

    Postcss

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard64 products
  • airflow-2All versions (No fix recorded)
  • airflow-core-2All versions (No fix recorded)
  • arangodb-3.11< 3.11.14.5-r1
  • arangodb-3.12< 3.12.9.4-r22
  • authentik-2025.12< 2025.12.6-r6
Wolfi13 products
  • jupyter-base-notebook< 7.6.3-r2
  • kubeflow-pipelines-apiserver< 2.17.2-r4
  • kubeflow-pipelines-frontend< 2.17.0-r3
  • kubeflow-pipelines-metadata-writer-compat< 2.17.2-r4
  • langfuse-3-compat< 3.225.7-r6
Debian1 product
  • node-postcssAll versions (No fix recorded) | < 8.5.23+~cs10.2.23-1
Npm1 product
  • postcss< 8.5.23
Postcss1 product
Redhat1 product
  • prometheus3.5< 0:3.5.5-0.7.hum1
Ubuntu1 product
  • node-postcssAll versions (No fix recorded)

7 vendors · 82 products

References

15 links
Show all 15 references