How severe is CVE-2016-2049?

CVE-2016-2049 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2016-2049 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-2049?

CVE-2016-2049 affects Janrain Php-openid. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2016-2049?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2016-2049 published?

CVE-2016-2049 was published on 2016-02-01 and last updated on 2026-06-17.

CVE-2016-2049

CVE-2016-2049 is a high-severity vulnerability in Janrain Php-openid with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-284.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.8
EPSS exploit prediction: 2% (80th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-284
Affected product: Janrain Php-openid
Published: 2016-02-01
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2016-2049?: CVE-2016-2049 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2016-2049 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-2049?: CVE-2016-2049 affects Janrain Php-openid. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2016-2049?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2016-2049 published?: CVE-2016-2049 was published on 2016-02-01 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:janrain:php-openid:*:*:*:*:*:*:*:*

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