CVE-2026-35569: ApostropheCMS is an open-source Node.js content management system

Q: How do I fix CVE-2026-35569?

apostrophecms: upgrade to 4.29.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-35569 being exploited?

CVE-2026-35569 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-35569 affect?

CVE-2026-35569 affects apostrophecms. Severity is high (CVSS 8.7). ApostropheCMS is an open-source Node.js content management system. Versions 4.28.0 and prior contain a stored cross-site scripting vulnerability in SEO-related fields (SEO Title and Meta Description), where user-controlled input is rendered

Q: How urgent is CVE-2026-35569?

Priority 41/100. High severity; Public exploit reference

This month

HIGH 8.7UPGRADE

CVE-2026-35569 is a high-severity flaw (CVSS 8.7) affecting apostrophecms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ApostropheCMS is an open-source Node.js content management system. Versions 4.28.0 and prior contain a stored cross-site scripting vulnerability in SEO-related fields (SEO Title and Meta Description), where user-controlled input is rendered without proper output encoding into HTML contexts including <title> tags, <meta> attributes, and JSON-LD structured data. An attacker can inject a payload such as "></title><script>alert(1)</script> to break o

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.7 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.3% (top 78%)
CISA exploited list	No
Weakness	CWE-79, CWE-116
Published	2026-04-15
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: apostrophecms

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-15 20:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

apostrophecms apostrophecms UPGRADE

Affected: < 4.29.0

Fixed in: 4.29.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy apostrophecms || rpm -q apostrophecms || apostrophecms --version

2. UPGRADE to 4.29.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade apostrophecms

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade apostrophecms

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-35569?

apostrophecms: upgrade to 4.29.0. Exact commands for each OS are on this page.

Is CVE-2026-35569 being exploited?

CVE-2026-35569 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-35569 affect?

CVE-2026-35569 affects apostrophecms. Severity is high (CVSS 8.7). ApostropheCMS is an open-source Node.js content management system. Versions 4.28.0 and prior contain a stored cross-site scripting vulnerability in SEO-related fields (SEO Title and Meta Description), where user-controlled input is rendered

How urgent is CVE-2026-35569?

Priority 41/100. High severity; Public exploit reference

Software pages

Node.js vulnerabilities

Related CVEs

CVE-2026-39857 MEDIUM 5.3 UPGRADE ApostropheCMS is an open-source Node.js content management system
CVE-2026-33877 LOW 3.7 UPGRADE ApostropheCMS is an open-source Node.js content management system
CVE-2026-33889 MEDIUM 5.4 UPGRADE ApostropheCMS is an open-source Node.js content management system
CVE-2026-33888 MEDIUM 5.3 UPGRADE ApostropheCMS is an open-source Node.js content management system
CVE-2026-40186 MEDIUM 6.1 DOWNGRADE UPGRADE ApostropheCMS is an open-source Node.js content management system

References

← Back to latest CVEs