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No exploitation reportedFix available

CVE-2021-29434

No exploitation reported by the sources we read.

  • Published2021-04-19
  • Fixed in2.12.4 · 2.11.7 · 2.11.6
  • WeaknessCWE-79

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

Wagtail is a Django content management system. In affected versions of Wagtail, when saving the contents of a rich text field in the admin interface, Wagtail does not apply server-side checks to ensure that link URLs use a valid protocol. A malicious user with access to the admin interface could thus craft a POST request to publish content with `javascript:` URLs containing arbitrary code. The vulnerability is not exploitable by an ordinary site visitor without access to the Wagtail admin. See referenced GitHub advisory for additional details, including a workaround. Patched versions have been released as Wagtail 2.11.7 (for the LTS 2.11 branch) and Wagtail 2.12.4 (for the current 2.12 branch).

Timeline

dates in UTC
  1. 2021-04-1919:15CVE publishedNVD

Versions per branch

NVD · OSV
Torchbox wagtail
BranchAffectedFixed in
2.12≥ 2.12.0, < 2.12.42.12.4
2.12≥ 2.12, < 2.12.42.12.4
2.11≥ 2.11.0, < 2.11.72.11.7
2.11< 2.11.72.11.7
2.11≥ 2.11, < 2.11.72.11.7
2.11< 2.11.62.11.6

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

Fix

  1. Update Torchbox wagtail to 2.12.4 · 2.11.7 · 2.11.6

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

  • CNACVSS 3.16.1known since 2026-10-23
  • NVDCVSS 3.14.8read 2026-10-23
  • NVDCVSS 2.03.5read 2026-10-23
  • CNAweakness (CWE)CWE-79known since 2026-10-23
  • FIRST EPSSEPSS score0.6 %2026-11-08
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryHIGH2021-04-19

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Published
2021-04-19
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-wq5h-f9p5-q7fx

Frequently asked questions

What is CVE-2021-29434?

Wagtail is a Django content management system. In affected versions of Wagtail, when saving the contents of a rich text field in the admin interface, Wagtail does not apply server-side checks to ensure that link URLs use a valid protocol. A malicious user with access to the admin interface could thus craft a POST request to publish content with `javascript:` URLs containing arbitrary code. The vulnerability is not exploitable by an ordinary site visitor without access to the Wagtail admin. See referenced GitHub advisory for additional details, including a workaround. Patched versions have been released as Wagtail 2.11.7 (for the LTS 2.11 branch) and Wagtail 2.12.4 (for the current 2.12 branch).

Is CVE-2021-29434 actively exploited?

Active exploitation of CVE-2021-29434 has not been confirmed. Its EPSS score was 0.6% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-29434?

CVE-2021-29434 has a CVSS v3 base score of 4.8 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.

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