How severe is CVE-2026-76203?

CVE-2026-76203 has a CVSS 4.0 base score of 5.1, rated medium severity.

Is CVE-2026-76203 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-76203?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-76203 published?

CVE-2026-76203 was published on 2026-08-19 and last updated on 2026-08-21.

CVE-2026-76203

CVE-2026-76203 is a medium-severity vulnerability with a CVSS 4.0 base score of 5.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-180.

Key facts

Severity: Medium (CVSS 4.0 base score 5.1)
EPSS exploit prediction: 0% (22nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-180
Published: 2026-08-19
Last modified: 2026-08-21

Description

Incorrect Behavior Order: Validate Before Canonicalize in the report theme CSS sanitizer in maalfer Pentestify 1.2.0 through 2.3.2 allows an authenticated user to force outbound HTTP requests from other users' browsers, disclosing their IP address and User-Agent, via CSS hex escapes that reconstruct the url() function and evade the sanitizer blocklist

Frequently asked questions

What is CVE-2026-76203?: Incorrect Behavior Order: Validate Before Canonicalize in the report theme CSS sanitizer in maalfer Pentestify 1.2.0 through 2.3.2 allows an authenticated user to force outbound HTTP requests from other users' browsers, disclosing their IP address and User-Agent, via CSS hex escapes that reconstruct the url() function and evade the sanitizer blocklist
How severe is CVE-2026-76203?: CVE-2026-76203 has a CVSS 4.0 base score of 5.1, rated medium severity.
Is CVE-2026-76203 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-76203?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-76203 published?: CVE-2026-76203 was published on 2026-08-19 and last updated on 2026-08-21.

References

Other CWE-180 vulnerabilities

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