VulnerabilityModified
CVE-2021-28121
Virtual Robots.txt before 1.10 does not block HTML tags in the robots.txt field.
CRITICAL 9.8EPSS 1.67%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.67%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Virtual Robots.txt before 1.10 does not block HTML tags in the robots.txt field.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 1.67% probability · 77th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Affected
- virtual robots.txt project/virtual robots.txt
- Source
- cve@mitre.org
EPSS 1.7% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://wordpress.org/plugins/pc-robotstxt/#developersRelease Notes, Vendor Advisory
- https://wordpress.org/plugins/pc-robotstxt/#developersRelease Notes, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.