CVE-2026-6990Public exploitNetwork attack vector

Stored JavaScript execution via unencoded responsible-party fields

Published Apr 25, 2026 · Updated Apr 25, 2026

Stored XSS in Projeto SIGA's SIGA 11.0.3.18 allows remote authenticated users to execute JavaScript through Nome or Descrição input. The responsible-party form stores these values and later inserts them into an anchor in the listing DOM without contextual output encoding, while incomplete tags bypass its filter. A user must submit a record and another authenticated user must open the listing, where the payload runs in that viewer's session context.

CVSS severity3.5
Low
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Projeto SIGA's SIGA 11.0.3.18 allows remote authenticated users to execute JavaScript through Nome or Descrição input. The responsible-party form stores these values and later inserts them into an anchor in the listing DOM without contextual output encoding, while incomplete tags bypass its filter. A user must submit a record and another authenticated user must open the listing, where the payload runs in that viewer's session context.

The record

CVE
CVE-2026-6990
Published
Apr 25, 2026
Updated
Apr 25, 2026
Vendor
Projeto SIGA
Product
SIGA
Classifications
CWE-79, CWE-94, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=11.0.3.18

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Projeto SIGA · SIGAversion=11.0.3.18

Published CVSS scores

4.0VulDBAV:N/AC:L/Au:S/C:N/I:P/A:N
2.0VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
3.5VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-94Improper Control of Generation of Code ('Code Injection')
T1059.007JavaScript/JScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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