What is CVE-2016-2049?

CVE-2016-2049 is a high-severity vulnerability in Janrain Php-Openid, classified under Improper Access Control. CVSS score: 8.8/10. Published 2016-02-01.

How severe is CVE-2016-2049?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Janrain Php-Openid

CVE-2016-2049

examples/consumer/common.php in JanRain PHP OpenID library (aka php-openid) improperly checks the openid.realm parameter against the SERVER_NAME element in the SERVER superglobal array, which might allow remote attackers to hijack the authentication of arbitrary users via vectors involving a crafted HTTP Host header.

Published 2016-02-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.022 (81.6th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 81.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.022 · newest: 0.022 · change: 0.000

Affected products

Janrain Php-Openid

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

www.openwall.com/lists/oss-security/2016/01/24/5 (mailing-list)
www.openwall.com/lists/oss-security/2016/01/24/2 (mailing-list)

Frequently asked questions

What is CVE-2016-2049?: CVE-2016-2049 is a high-severity vulnerability in Janrain Php-Openid, classified under Improper Access Control. CVSS score: 8.8/10. Published 2016-02-01.
How severe is CVE-2016-2049?: High severity. CVSS v3 base score is 8.8 out of 10.