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Fencer Intel
medium 5.4

CVE-2021-41918 json

webTareas version 2.4 and earlier allows an authenticated user to inject arbitrary web script or HTML due to incorrect sanitization of user…

published 5y ago modified 4mo ago also EUVD-2021-28916

cvss
5.4
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 47%
public exploits
0
none known

Summary

webTareas version 2.4 and earlier allows an authenticated user to inject arbitrary web script or HTML due to incorrect sanitization of user-supplied data and achieve a Reflected Cross-Site Scripting attack against the platform users and administrators. The issue affects every endpoint on the application because it is related on how each URL is echoed back on every response page.

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Exploit prediction

0.57% chance of exploitation in the next 30 days, higher than 47% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • n4nj0.github.io https://n4nj0.github.io/advisories/webtareas-multiple-vulnerabilities-i/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 3.5 AV:N/AC:M/Au:S/C:N/I:P/A:N

Classification

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

References

Sources

Fencer Intel 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.