CVE-2026-69153 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-69153MEDIUM

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

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   P   N   N   L   N   N    6.3   .0031   24.1     —

AFFECTED
  Product  Versions    Fixed
  postcss  < 8.5.19 –  —

TIMELINE
  Aug 3   EXPLOIT PUBLISHED — CVE-2026-69153 (postcss). Public exploit reference added.
  Aug 3   Reserved by GitHub_M
  Aug 3   Published (CNA: GitHub_M)

CWE-22, CWE-200 · CNA: GitHub_M · CVSS v4.0 · 3 references · NVD status: Analyzed

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
August 3, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-69153 (postcss). Public exploit reference added.
August 3, 2026	Reserved	Reserved by GitHub_M
August 3, 2026	Published	Published (CNA: GitHub_M)

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
postcss	postcss	—	< 8.5.19	—

Weaknesses

CWE-22 · CWE-200

References (3)

https://github.com/postcss/postcss/commit/7beca139e70f9075c6b19700fcb00dd8033e5da8 [Patch]
https://github.com/postcss/postcss/releases/tag/8.5.19 [Product, Release Notes]
https://github.com/postcss/postcss/security/advisories/GHSA-fxqj-rqcc-2cmp [Exploit, Mitigation, Vendor Advisory]

Authoritative record: CVE-2026-69153 at cve.org

Vendors: postcss

Weaknesses: CWE-22 · CWE-200

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-69153 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.