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CVE-2026-121763VulnerabilityPublished

WPMU DEV · Cross-site Scripting

Source GCVE Database

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Authoritative record:CVE-2026-121763· Medium 6.5

Not known to be exploited · CVSS 6.5 Medium : upgrade to 4.0.0 when convenient.

Data as of 9 Nov 2026, 13:21 UTC

CVSS 3.1 base score
6.5Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (Patchstack)CVSS 3.16.5
Patch
Available – fixed in 4.0.0
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 9 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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 9 Nov 2026.

What to do

Upgrade Hummingbird to 4.0.0.

Affected software

ProductAffectedFixed in
Hummingbirdhummingbird-performanceAffected
  • <4.0.0
Fixed in
  • 4.0.0

AI-suggested

If you cannot patch yet, limit user privileges and avoid interacting with untrusted content generated by the plugin.

Description

A stored cross-site scripting (XSS) vulnerability exists in WPMU DEV Hummingbird plugin versions up to 3.21.2. This vulnerability allows improper neutralization of input during web page generation, potentially enabling an attacker with low privileges to execute malicious scripts in the context of other users. The vulnerability has a medium severity rating with a CVSS score of 6.5.

References

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