CVE-2020-26136
Authentication bypass in SilverStripe GraphQL
In SilverStripe through 4.6.0-rc1, GraphQL doesn't honour MFA (multi-factor authentication) when using basic authentication.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
In SilverStripe through 4.6.0-rc1, GraphQL doesn't honour MFA (multi-factor authentication) when using basic authentication.
- Record
CVE-2020-26136- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N - CVSS 2.0
- 4.0 Medium
AV:N/AC:L/Au:S/C:N/I:P/A:N - Weakness
- CWE-287
- Updated
- 2026-11-02
CVE List No score
In SilverStripe through 4.6.0-rc1, GraphQL doesn't honour MFA (multi-factor authentication) when using basic authentication.
- Record
CVE-2020-26136- Updated
- 2026-11-02
EUVDEUVD-2021-1357 No score
In SilverStripe through 4.6.0-rc1, GraphQL doesn't honour MFA (multi-factor authentication) when using basic authentication.
- Record
EUVD-2021-1357- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-mg2g-8pwj-r2j2
Authentication bypass in SilverStripe GraphQL
The GraphQL module accepts basic-auth as an authentication method by default. This can be used to bypass MFA authentication if the silverstripe/mfa module is installed, which is now a commonly installed module. A users password is still required though.
Basic-auth has been removed as a default authentication method. If desired, it can be re-enabled by adding it to the authenticators key of a schema, or on SilverStripe\Graphql\Auth\Handler
- Record
GHSA-mg2g-8pwj-r2j2- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-287, CWE-288
- Updated
- 2026-11-02
OSV
In SilverStripe through 4.6.0-rc1, GraphQL doesn't honour MFA (multi-factor authentication) when using basic authentication.
- Record
CVE-2020-26136- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N - Updated
- 2026-11-02
OSVGHSA-mg2g-8pwj-r2j2
Authentication bypass in SilverStripe GraphQL
The GraphQL module accepts basic-auth as an authentication method by default. This can be used to bypass MFA authentication if the silverstripe/mfa module is installed, which is now a commonly installed module. A users password is still required though.
Basic-auth has been removed as a default authentication method. If desired, it can be re-enabled by adding it to the authenticators key of a schema, or on SilverStripe\Graphql\Auth\Handler
- Record
GHSA-mg2g-8pwj-r2j2- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-287, CWE-288
- Updated
- 2026-11-02
OSVBIT-silverstripe-2020-26136 No score
In SilverStripe through 4.6.0-rc1, GraphQL doesn't honour MFA (multi-factor authentication) when using basic authentication.
- Record
BIT-silverstripe-2020-26136- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
silverstripe/graphqlPackagist |
3.0.0 up to 3.5.0 | 3.5.0 |
silverstripe/graphqlPackagist |
4.0.0-alpha1 up to 4.0.0-alpha2 | 4.0.0-alpha2 |
silverstripeBitnami |
before 4.6.0, 4.6.0-rc1 to 4.6.0-rc1 | 4.6.0 |
silverstripe/graphqlPackagist |
3.0.0 up to 3.5.0, plus listed versions 3.0.13.0.23.0.33.0.43.1.0 Show 23 moreShow less3.1.0-rc13.1.13.1.23.1.33.1.43.1.53.2.03.2.0-alpha13.2.0-rc13.2.0-rc23.2.13.2.23.2.33.2.43.3.03.3.0-beta13.3.0-rc13.4.03.4.0-beta13.4.0-rc13.4.13.5.0-beta13.5.0-rc1 |
3.5.0 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-26136 is a medium vulnerability (CVSS 6.5) in Silverstripe, published June 8, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.16%, the 67th percentile. Fixed in silverstripe/graphql 3.5.0.
References
silverstripe.org/download/security-releases
forum.silverstripe.org/c/releases
nvd.nist.gov/vuln/detail/CVE-2020-26136
github.com/FriendsOfPHP/security-advisories/blob/master/silverstripe/graphql/CVE-2020-26136.yaml