CVE-2017-18262

Blackboard Learn (Since at least 17th of October 2017) has allowed Unvalidated Redirects on any signed-in user through its endpoints for handling Shibboleth logins, as demonstrated by a webapps/bb-auth-provider-shibboleth-BBLEARN/execute/shibbolethLogin?returnUrl= URI.

Published: 2018-04-30 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-18262 is rated Moderate Risk (50.1/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.47%). EPSS rose +1.14% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2017-18262

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.33% 1.47% +1.14%
2 2025-03-17 0.13% 0.33% +0.20%
3 2023-07-08 — 0.13% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-18262

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.1 3.0 MEDIUM
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 2.7 [email protected]
5.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 4.9 [email protected]

Weakness enumeration for CVE-2017-18262

Affected software / configurations for CVE-2017-18262

Vendor Product Version Raw CPE
blackboard blackboard_learn <= 9.1 cpe:2.3:a:blackboard:blackboard_learn:*:*:*:*:*:*:*:*
blackboard blackboard_learn 9.1 cpe:2.3:a:blackboard:blackboard_learn:9.1:q2_2016:*:*:*:*:*:*
blackboard blackboard_learn 9.1 cpe:2.3:a:blackboard:blackboard_learn:9.1:q2_2017:*:*:*:*:*:*
blackboard blackboard_learn 9.1 cpe:2.3:a:blackboard:blackboard_learn:9.1:q4_2015:*:*:*:*:*:*
blackboard blackboard_learn 9.1 cpe:2.3:a:blackboard:blackboard_learn:9.1:q4_2016:*:*:*:*:*:*
blackboard blackboard_learn 9.1 cpe:2.3:a:blackboard:blackboard_learn:9.1:q4_2017:*:*:*:*:*:*

References for CVE-2017-18262

URL Tags
http://seclists.org/fulldisclosure/2018/Apr/57 Mailing List Third Party Advisory
http://www.securitytracker.com/id/1040767 Third Party Advisory VDB Entry
https://ethan.pm/blackboard.txt Third Party Advisory
cvelogic Threat Intelligence