CVE-2022-31157
Use of a Broken or Risky Cryptographic Algorithm in packbackbooks/lti-1-3-php-library
LTI 1.3 Tool Library is a library used for building IMS-certified LTI 1.3 tool providers in PHP. Prior to version 5.0, the function used to generate random nonces was not sufficiently cryptographically complex. Users should upgrade to version 5.0 to receive a patch. There are currently no known workarounds.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Use of a Broken or Risky Cryptographic Algorithm in packbackbooks/lti-1-3-php-library
LTI 1.3 Tool Library is a library used for building IMS-certified LTI 1.3 tool providers in PHP. Prior to version 5.0, the function used to generate random nonces was not sufficiently cryptographically complex. Users should upgrade to version 5.0 to receive a patch. There are currently no known workarounds.
- Record
CVE-2022-31157- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-327
- Updated
- 2026-11-02
EUVDEUVD-2022-6276
LTI 1.3 Tool Library is a library used for building IMS-certified LTI 1.3 tool providers in PHP. Prior to version 5.0, the function used to generate random nonces was not sufficiently cryptographically complex. Users should upgrade to version 5.0 to receive a patch. There are currently no known workarounds.
- Record
EUVD-2022-6276- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-768m-5w34-2xf5
LTI 1.3 Tool Library's function used to generate random nonces not sufficiently cryptographically complex before v5.0
Impact
The function used to generate random nonces was not sufficiently cryptographically complex. As a result values may be predictable and tokens may be forgable.
Patches
Users should upgrade to version 5.0 immediately
Workarounds
None.
- Record
GHSA-768m-5w34-2xf5- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-327, CWE-330
- Updated
- 2026-11-02
NVD
LTI 1.3 Tool Library is a library used for building IMS-certified LTI 1.3 tool providers in PHP. Prior to version 5.0, the function used to generate random nonces was not sufficiently cryptographically complex. Users should upgrade to version 5.0 to receive a patch. There are currently no known workarounds.
- Record
CVE-2022-31157- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-327, CWE-330
- Updated
- 2026-11-02
OSV
Use of a Broken or Risky Cryptographic Algorithm in packbackbooks/lti-1-3-php-library
LTI 1.3 Tool Library is a library used for building IMS-certified LTI 1.3 tool providers in PHP. Prior to version 5.0, the function used to generate random nonces was not sufficiently cryptographically complex. Users should upgrade to version 5.0 to receive a patch. There are currently no known workarounds.
- Record
CVE-2022-31157- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-327
- Updated
- 2026-11-02
OSVGHSA-768m-5w34-2xf5
LTI 1.3 Tool Library's function used to generate random nonces not sufficiently cryptographically complex before v5.0
Impact
The function used to generate random nonces was not sufficiently cryptographically complex. As a result values may be predictable and tokens may be forgable.
Patches
Users should upgrade to version 5.0 immediately
Workarounds
None.
- Record
GHSA-768m-5w34-2xf5- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-327, CWE-330
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
packbackbooks/lti-1-3-php-libraryPackagist |
before 5.0 | 5.0 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2022-31157 is a high vulnerability (CVSS 7.5) in Packback Lti 1.3 Tool Library, published July 15, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.45%, the 39th percentile. Fixed in packbackbooks/lti-1-3-php-library 5.0.
References
github.com/packbackbooks/lti-1-3-php-library/security/advisories/GHSA-768m-5w34-2xf5
openid.net/specs/openid-connect-core-1_0.html
nvd.nist.gov/vuln/detail/CVE-2022-31157