VulnerabilityPublished 29 Sep 2023Updated 3 Nov 2025

CVE-2023-44270: postcss · CVE-2023-44270 is a

Affects postcssSource CVE Database V5

Not known to be exploited : upgrade to 8.4.31 when convenient.

Data as of 26 Oct 2026, 09:15 UTC

Severity

Medium

Rated Medium by the CNA (mitre) · No CVSS score from NVD or the CNA

EPSS: 0.9% chance of exploitation in 30 days – higher than 61% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 8.4.31

Exploitation evidence

Disclosed: evidence found.
CVE published 29 Sep 2023
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade postcss/postcss to 8.4.31.

Affected software

Product	Affected	Fixed in
npmpostcss/postcss`pkg:npm/postcss/postcss`Other threats	Affected <8.4.31	Fixed in 8.4.31

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix is available in PostCSS version 8.4.31. Users of affected versions should upgrade to 8.4.31 or later to remediate this vulnerability. No additional mitigation steps are indicated by the vendor advisory.

Description

CVE-2023-44270 is a vulnerability in PostCSS versions prior to 8.4.31. It affects linters that use PostCSS to parse external untrusted CSS. An attacker can craft CSS that includes parts parsed as comments by PostCSS but later included in the output as CSS nodes, potentially bypassing comment-based filtering or processing.

References

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