CVE-2026-43505

MEDIUM

6.5

CVSS v3

Description

An issue was discovered in Prosody before 0.12.6 and 1.0.0 through 13.0.0 before 13.0.5, when mod_proxy65 is enabled. Because mod_proxy65 mishandles access control in the activation scenario, relaying of unauthenticated traffic can occur.

CWE-420

How to fix

Remediation Available

prosodyDebian

Fixed in:0.12.3-1+deb12u1CVE-2026-43505

Fixed in:13.0.1-1+deb131uCVE-2026-43505

Fixed in:13.0.5-1CVE-2026-43505

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityLow

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

Exploit Intelligence

0.20%probability of exploitation in 30 days

11thpercentile

Low risk: more likely to be exploited than 11% of all known CVEs.

References

Patch2

Related Vulnerabilities

Other CWE-420 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-20198	Critical	10.0	100%	KEV	Fix
CVE-2025-54309	Critical	9.0	94%	KEV	Fix
CVE-2024-10081	Critical	10.0	39%	-	Fix
CVE-2025-13315	Critical	9.8	33%	-	-
CVE-2024-6242	Unscored	-	9.2%	-	-
CVE-2025-53967	High	8.0	7.4%	-	-

Common questions

How do I fix CVE-2026-43505?

Upgrade prosody on debian 12 to 0.12.3-1+deb12u1 or later.

Is CVE-2026-43505 being actively exploited?

Not that we know of. CVE-2026-43505 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.20% is the estimated probability that it will be exploited in the next 30 days. That is higher than 11% of all scored CVEs.

How severe is CVE-2026-43505?

CVE-2026-43505 has a CVSS v3 base score of 6.5, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-43505 affect?

Published advisories record a fix for prosody (Debian). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-01.