CVE-2026-72887

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2026-72887
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72887.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-72887
Aliases
  • GHSA-jh72-4qq2-8j6g
Downstream
Related
Published
2026-08-16T13:50:19Z
Modified
2026-08-28T11:30:36Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
Net::OAuth::Client versions before 0.32 for Perl allow the service provider to silently downgrade OAuth 1.0a to OAuth 1.0 in get_request_token
Details

Net::OAuth::Client versions before 0.32 for Perl allow the service provider to silently downgrade OAuth 1.0a to OAuth 1.0 in get_request_token.

Passing a callback to the constructor selects OAuth 1.0a. get_request_token then revokes that choice when the request token response omits oauth_callback_confirmed, with no exception, no warning and no option to require 1.0a. The access token request is built from the OAuth 1.0 message class, which has no verifier parameter, so oauth_verifier is dropped from the request even when get_access_token was passed one.

oauth_verifier is the binding that OAuth 1.0a added between the authorization step and the token exchange. An application that asked for 1.0a and gets 1.0 is open to OAuth 1.0 session fixation, where an attacker obtains a request token, has the victim authorize it, and then completes the exchange themselves, linking the victim's provider account to a session the attacker controls. No attacker action sets up the downgrade: a provider that does not confirm the callback is enough.

Database specific 
{
    "cna_assigner": "CPANSec",
    "cwe_ids": [
        "CWE-757"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72887.json"
}
References

Affected packages

Git / github.com/vurtdev/net-oauth

Affected ranges

Type
GIT
Repo
https://github.com/vurtdev/net-oauth
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
d41b28dbf8a15512685974aa9af03fe4bfb611ea
Fixed
fd505dac1988723ed96721657663f2e4ac731644
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.32"
        }
    ],
    "source": [
        "DESCRIPTION",
        "REFERENCES"
    ]
}

Affected versions

v0.*
v0.29
v0.30
v0.31

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72887.json"