What is CVE-2018-13257?

CVE-2018-13257 is a medium-severity vulnerability in Blackboard Learn, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2019-11-18.

How severe is CVE-2018-13257?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2018-13257 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Open Redirect in Blackboard Learn

CVE-2018-13257

The bb-auth-provider-cas authentication module within Blackboard Learn 2018-07-02 is susceptible to HTTP host header spoofing during Central Authentication Service (CAS) service ticket validation, enabling a phishing attack from the CAS server login page.

Vulnerability class: Open Redirect

Published 2019-11-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.012 (67.2th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 67.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Blackboard Learn — versions 2018-07-02

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

Public proof-of-concept exploits

References

github.com/gluxon/CVE-2018-13257 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2018-13257?: CVE-2018-13257 is a medium-severity vulnerability in Blackboard Learn, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2019-11-18.
How severe is CVE-2018-13257?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2018-13257 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.