CVE-2026-22250

API traffic interception via prefix-matched localhost hostnames

Published Jan 12, 2026 · Updated Jan 12, 2026

Improper certificate validation in Weblate Client before 1.17.0 allows context-dependent attackers to intercept API traffic. Weblate.should_verify_ssl treated any URL authority beginning with 127.0.0.1 as localhost and disabled TLS certificate verification instead of comparing the parsed hostname exactly. The attack requires a crafted API URL in an untrusted wlc configuration and user invocation, exposing request or response data to interception.

CVSS severity2.5
Low
EPSS probability0.16%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper certificate validation in Weblate Client before 1.17.0 allows context-dependent attackers to intercept API traffic. Weblate.should_verify_ssl treated any URL authority beginning with 127.0.0.1 as localhost and disabled TLS certificate verification instead of comparing the parsed hostname exactly. The attack requires a crafted API URL in an untrusted wlc configuration and user invocation, exposing request or response data to interception.

The record

CVE
CVE-2026-22250
Published
Jan 12, 2026
Updated
Jan 12, 2026
Vendor
Weblate
Product
Weblate Client
Classifications
CWE-295, T1557
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Jan 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=< 1.17.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Weblate · Weblate Clientversion=< 1.17.0

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
2.5GitHub, Inc.CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:L/I:N/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)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-295Improper Certificate Validation
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo