CVE-2026-67281: RouterOS WebFig contains an unauthenticated file-read vulnerability in the /jsproxy path where a newly allocat

Q: How do I fix CVE-2026-67281?

routeros: upgrade to 7.23.4, 7.24.2. Exact commands for each OS are on this page.

Q: Is CVE-2026-67281 being exploited?

CVE-2026-67281 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-67281 affect?

CVE-2026-67281 affects routeros. Severity is high (CVSS 7.5). RouterOS WebFig contains an unauthenticated file-read vulnerability in the /jsproxy path where a newly allocated session retains a stale uninitialized principal pointer used for file authorization. An unauthenticated attacker can prepare th

Q: How urgent is CVE-2026-67281?

Priority 50/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2026-67281 is a high-severity flaw (CVSS 7.5) affecting routeros. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

RouterOS WebFig contains an unauthenticated file-read vulnerability in the /jsproxy path where a newly allocated session retains a stale uninitialized principal pointer used for file authorization. An unauthenticated attacker can prepare the allocator so that the file-serving path dereferences this pointer with sufficient rights, then supply parent-directory components in an encrypted URI to escape the WebFig file namespace and disclose root-owne

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-22, CWE-824
Published	2026-09-05
Last modified	2026-09-25

Publisher (CNA): CERT.PL · Vendor: mikrotik

Last updated 2026-09-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-05 20:17 UTCPublished CVE record published
2026-09-25 14:21 UTCUpdated Record last modified

mikrotik routeros UPGRADE

Affected: >= 7.20 and < 7.23.4 · >= 7.24 and < 7.24.2

Fixed in: 7.23.4, 7.24.2

Safe to downgrade to: a release before 7.20

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Advisories and coverage

Official advisories

CERT Polska: Vulnerabilities in Mikrotik RouterOS software 2026-09-05

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-67281?

routeros: upgrade to 7.23.4, 7.24.2. Exact commands for each OS are on this page.

Is CVE-2026-67281 being exploited?

CVE-2026-67281 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-67281 affect?

CVE-2026-67281 affects routeros. Severity is high (CVSS 7.5). RouterOS WebFig contains an unauthenticated file-read vulnerability in the /jsproxy path where a newly allocated session retains a stale uninitialized principal pointer used for file authorization. An unauthenticated attacker can prepare th

How urgent is CVE-2026-67281?

Priority 50/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

MikroTik vulnerabilities

Related CVEs

CVE-2026-67279 MEDIUM 6.5 EXPLOITED UPGRADE Mikrotik RouterOS Improper Enforcement of Behavioral Workflow Vulnerability
CVE-2026-67276 HIGH 8.1 UPGRADE RouterOS does not compare the complete RSA public key when matching an SSH authentication request to an author
CVE-2026-67278 CRITICAL 9.1 UPGRADE MikroTik RouterOS accepts malformed RSA/PKCS#1 v1.5 signatures across RSA-based services, including TLS/X.509
CVE-2026-67277 HIGH 8.2 EXPLOITED UPGRADE MikroTik RouterOS Missing Authentication for Critical Function Vulnerability
CVE-2026-86060 CRITICAL 9.8 EXPLOITED UPGRADE MikroTik RouterOS Improper Neutralization of Argument Delimiters in a Command Vulnerability

References

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