CVE-2021-24437 json
Favicon by RealFaviconGenerator <= 1.3.20 - Reflected Cross-Site Scripting (XSS)
published 2021-08-30 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-11349
- cvss
- 6.1
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.8%
- EPSS 0.8% chance of exploitation in 30 days, percentile 57%
- public exploits
- 0
- none known
Summary
The Favicon by RealFaviconGenerator WordPress plugin through 1.3.20 does not sanitise or escape one of its parameter before outputting it back in the response, leading to a Reflected Cross-Site Scripting (XSS) which is executed in the context of a logged administrator.
Patch / fix
- realfavicongenerator favicon_by_realfavicongenerator 1.3.22
Exploit prediction
0.83% chance of exploitation in the next 30 days, higher than 57% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- wpscan.com https://wpscan.com/vulnerability/ed9d26be-cc96-4274-a05b-0b7ad9d8cfd9 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N |
Affected products
- Unknown Favicon by RealFaviconGenerator
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
- Technology feeds
References
-
wpscan.com
/vulnerability/ed9d26be-cc96-4274-a05b-0b7ad9d8cfd9
exploit, third-party-advisory
Sources
- CVE List CVE-2021-24437
- NVD CVE-2021-24437
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.