CVE-2012-0007 — The Microsoft Anti-Cross Site Scripting (AntiXSS) Library 3

The Microsoft Anti-Cross Site Scripting (AntiXSS) Library 3.x and 4.0 does not properly evaluate characters after the detection of a Cascading Style Sheets (CSS) escaped character, which allows remote attackers to conduct cross-site scripting (XSS) attacks via HTML input, aka &qu

01What is this vulnerability?

The Microsoft Anti-Cross Site Scripting (AntiXSS) Library 3.x and 4.0 does not properly evaluate characters after the detection of a Cascading Style Sheets (CSS) escaped character, which allows remote attackers to conduct cross-site scripting (XSS) attacks via HTML input, aka "AntiXSS Library Bypass Vulnerability."

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

Open in Sigma generator →

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2012-01-10T21:00:00.000Z
• Last modified: 2024-08-06T18:09:17.209Z

09References

• www.securityfocus.com — http://www.securityfocus.com/bid/51291
• www.us-cert.gov — http://www.us-cert.gov/cas/techalerts/TA12-010A.html
• www.securitytracker.com — http://www.securitytracker.com/id?1026499
• docs.microsoft.com — https://docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-00…
• oval.cisecurity.org — https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3…
• secunia.com — http://secunia.com/advisories/47483
• secunia.com — http://secunia.com/advisories/47516