PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-45012 apostrophecms CVE debrief

ApostropheCMS, an open-source Node.js content management system, is vulnerable to an authenticated server-side request forgery (SSRF) attack in the rich-text widget import flow. This vulnerability, tracked as CVE-2026-45012, affects versions up to and including 4.29.0. An authenticated user who can submit or edit rich-text widget content can cause the server to fetch attacker-controlled URLs during widget validation. For image-compatible responses, the fetched content can be persisted and re-hosted by Apostrophe, potentially allowing response exfiltration. The CVSS score for this vulnerability is 7.6, indicating a High severity level. The vulnerability was published on June 12, 2026, and as of the publication date, no patched versions are available.

Vendor
apostrophecms
Product
apostrophe
CVSS
HIGH 7.6
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-12
Original CVE updated
2026-06-15
Advisory published
2026-06-12
Advisory updated
2026-06-15

Who should care

Users of ApostropheCMS, particularly those with authenticated access to rich-text widget content, should be aware of this vulnerability and take necessary precautions. Developers and administrators of ApostropheCMS instances should prioritize updating to a patched version once available.

Technical summary

CVE-2026-45012 is an authenticated SSRF vulnerability in ApostropheCMS's rich-text widget import flow. It allows an authenticated user to cause the server to fetch attacker-controlled URLs, potentially leading to response exfiltration. The vulnerability has a CVSS score of 7.6 and is classified as High severity.

Defensive priority

High

Recommended defensive actions

  • Review and monitor rich-text widget content submissions for potential SSRF attempts.
  • Restrict access to rich-text widget content editing to trusted users.
  • Consider implementing additional security measures, such as URL filtering or whitelisting, for widget validation.
  • Upgrade to a patched version of ApostropheCMS as soon as available.

Evidence notes

The CVE-2026-45012 vulnerability is confirmed to exist in ApostropheCMS versions up to and including 4.29.0. The vulnerability allows for authenticated SSRF attacks in the rich-text widget import flow. No patched versions are available at the time of publication.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-45012 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-45012

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-45012 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-45012

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.