DEBIAN-CVE-2026-72887
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.
DEBIAN-CVE-2026-72887
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-72887
libnet-oauth-perl
Source reference: /affected/0/package/name
- Affected versions
- 0.28-4
Source reference:
/affected/0/versions0.30-1Source reference:
/affected/0/versions0.31-1Source reference:
/affected/0/versions0.31-2Source reference:
/affected/0/versions0.32-1Source reference:
/affected/0/versions0.33-1Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
libnet-oauth-perl
Source reference: /affected/1/package/name
- Affected versions
- 0.31-1
Source reference:
/affected/1/versions0.31-2Source reference:
/affected/1/versions0.32-1Source reference:
/affected/1/versions0.33-1Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
libnet-oauth-perl
Source reference: /affected/2/package/name
- Affected versions
- 0.31-1
Source reference:
/affected/2/versions0.31-2Source reference:
/affected/2/versions - Fixed versions
- 0.32-1
Source reference:
/affected/2/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libnet-oauth-perl",
"purl": "pkg:deb/debian/libnet-oauth-perl?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"0.28-4",
"0.30-1",
"0.31-1",
"0.31-2",
"0.32-1",
"0.33-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-72887.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libnet-oauth-perl",
"purl": "pkg:deb/debian/libnet-oauth-perl?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"0.31-1",
"0.31-2",
"0.32-1",
"0.33-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-72887.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.32-1"
}
]
}
],
"package": {
"name": "libnet-oauth-perl",
"purl": "pkg:deb/debian/libnet-oauth-perl?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"0.31-1",
"0.31-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-72887.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #58171 · Revision 1
- Added to Heist Feed
- Publisher date