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Fencer Vulns
medium 6.1

CVE-2021-33904 json

In Accela Civic Platform through 21.1, the security/hostSignon.do parameter servProvCode is vulnerable to XSS.

published 2021-06-07 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-20576

cvss
6.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
10.0%
EPSS 10.0% chance of exploitation in 30 days, percentile 95%
public exploits
1
Exploit-DB, plus a Nuclei check

Summary

In Accela Civic Platform through 21.1, the security/hostSignon.do parameter servProvCode is vulnerable to XSS. NOTE: The vendor states "there are configurable security flags and we are unable to reproduce them with the available information.

Timeline

  1. Published
  2. First public exploit (EDB-49980)

Exploit prediction

9.97% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-49980 Accela Civic Platform 21.1 - 'servProvCode' Cross-Site-Scripting (XSS) webapps, 2021-06-11
  • Nuclei template Accela Civic Platform <=21.1 - Cross-Site Scripting nuclei detection template
  • packetstormsecurity.com http://packetstormsecurity.com/files/163093/Accela-Civic-Platorm-21.1-Cross-Site-Scripting.html 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

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

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.