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No exploitation reportedFix available

CVE-2023-44270

No exploitation reported by the sources we read.

  • Published2023-09-29
  • Fixed in8.4.31
  • WeaknessCWE-74

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

An issue was discovered in PostCSS before 8.4.31. The vulnerability affects linters using PostCSS to parse external untrusted CSS. An attacker can prepare CSS in such a way that it will contains parts parsed by PostCSS as a CSS comment. After processing by PostCSS, it will be included in the PostCSS output in CSS nodes (rules, properties) despite being included in a comment.

Timeline

dates in UTC
  1. 2023-09-2922:15CVE publishedNVD

Versions per branch

NVD · OSV
Postcss
BranchAffectedFixed in
8.4< 8.4.318.4.31

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • @rootio/postcssRoot:npmall versions · fixed in 7.0.39-root.io.2
  • @rootio/postcssRoot:npmall versions · fixed in 5.2.18-root.io.3
  • @rootio/postcssRoot:npmall versions · fixed in 5.2.18-root.io.4
  • @rootio/postcssRoot:npmall versions · fixed in 5.2.18-root.io.5
  • @rootio/postcssRoot:npmall versions · fixed in 7.0.39-root.io.1
  • @rootio/postcssRoot:npmall versions · fixed in 7.0.39-root.io.3
  • @rootio/postcssRoot:npmall versions · fixed in 7.0.39-root.io.4
  • @rootio/postcssRoot:npmall versions · fixed in 7.0.39-root.io.5

59 more package ranges on OSV.dev

Vendor advisories

  • CVE-2023-44270 Red Hat Product Security955 products fixed · 73 known affected

    PostCSS: Improper input validation in PostCSS

    io.cryostat-cryostat3.src as a component of Cryostat 3 · openshift-logging/kibana6-rhel8 as a component of Logging Subsystem for Red Hat OpenShift · openshift-logging/logging-view-plugin-rhel8 as a component of Logging Subsystem for Red Hat OpenShift · +70 more

  • RHSA-2025:3069 Red Hat Product Security35 products fixed

    Red Hat Security Advisory: Errata Advisory for Red Hat OpenShift GitOps v1.14.3 security update

  • RHSA-2025:2652 Red Hat Product Security9 products fixed

    Red Hat Security Advisory: RHODF-4.18-RHEL-9 enhancement, bug fix and security update

  • RHSA-2025:1866 Red Hat Product Security9 products fixed

    Red Hat Security Advisory: RHODF-4.14-RHEL-9 security update

  • RHSA-2025:1865 Red Hat Product Security9 products fixed

    Red Hat Security Advisory: RHODF-4.15-RHEL-9 security update

  • RHSA-2025:1829 Red Hat Product Security9 products fixed

    Red Hat Security Advisory: RHODF-4.16-RHEL-9 security update

8 more advisories

Full record on NVD

Fix

  1. Update Postcss to 8.4.31
  2. Vendor fix Red Hat Product Security RHSA-2025:3069 · 35 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
  3. Vendor fix Red Hat Product Security RHSA-2025:2652 · 9 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
  4. Vendor fix Red Hat Product Security RHSA-2025:1866 · 9 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
  5. Vendor fix Red Hat Product Security RHSA-2024:6122 · 662 productsFor OpenShift Container Platform 4.18 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.openshift.com/container-platform/4.18/release_notes/o…
  6. Vendor fix Red Hat Product Security RHSA-2024:6121 · 191 productsFor OpenShift Container Platform 4.18 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.openshift.com/container-platform/4.18/release_notes/ocp-4-1…
  7. Vendor fix Red Hat Product Security RHSA-2025:0654 · 4 productsFor OpenShift Container Platform 4.17 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.openshift.com/container-platform/4.17/release_notes/o…

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Published
2023-09-29
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-7fh5-64p2-3v2j

Frequently asked questions

What is CVE-2023-44270?

An issue was discovered in PostCSS before 8.4.31. The vulnerability affects linters using PostCSS to parse external untrusted CSS. An attacker can prepare CSS in such a way that it will contains parts parsed by PostCSS as a CSS comment. After processing by PostCSS, it will be included in the PostCSS output in CSS nodes (rules, properties) despite being included in a comment.

Is CVE-2023-44270 actively exploited?

Active exploitation of CVE-2023-44270 has not been confirmed. Its EPSS score was 1.0% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-44270?

CVE-2023-44270 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

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