CVE-2021-23803
Access Control Bypass
This affects the package latte/latte before 2.10.6. There is a way to bypass allowFunctions that will affect the security of the application. When the template is set to allow/disallow the use of certain functions, adding control characters (x00-x08) after the function will bypass these restrictions.
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
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Access Control Bypass
This affects the package latte/latte before 2.10.6. There is a way to bypass allowFunctions that will affect the security of the application. When the template is set to allow/disallow the use of certain functions, adding control characters (x00-x08) after the function will bypass these restrictions.
- Record
CVE-2021-23803- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P - Updated
- 2026-11-02
EUVDEUVD-2022-0484
This affects the package latte/latte before 2.10.6. There is a way to bypass allowFunctions that will affect the security of the application. When the template is set to allow/disallow the use of certain functions, adding control characters (x00-x08) after the function will bypass these restrictions.
- Record
EUVD-2022-0484- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-6pj2-5fqq-xvjc
Incorrect Authorization in latte/latte
This affects the package latte/latte before 2.10.6. There is a way to bypass allowFunctions that will affect the security of the application. When the template is set to allow/disallow the use of certain functions, adding control characters (x00-x08) after the function will bypass these restrictions.
- Record
GHSA-6pj2-5fqq-xvjc- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-863
- Updated
- 2026-11-02
NVD
This affects the package latte/latte before 2.10.6. There is a way to bypass allowFunctions that will affect the security of the application. When the template is set to allow/disallow the use of certain functions, adding control characters (x00-x08) after the function will bypass these restrictions.
- Record
CVE-2021-23803- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-863
- Updated
- 2026-11-02
OSV
This affects the package latte/latte before 2.10.6. There is a way to bypass allowFunctions that will affect the security of the application. When the template is set to allow/disallow the use of certain functions, adding control characters (x00-x08) after the function will bypass these restrictions.
- Record
CVE-2021-23803- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVGHSA-6pj2-5fqq-xvjc
Incorrect Authorization in latte/latte
This affects the package latte/latte before 2.10.6. There is a way to bypass allowFunctions that will affect the security of the application. When the template is set to allow/disallow the use of certain functions, adding control characters (x00-x08) after the function will bypass these restrictions.
- Record
GHSA-6pj2-5fqq-xvjc- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-863
- Updated
- 2026-11-02
OSVUBUNTU-CVE-2021-23803
This affects the package latte/latte before 2.10.6. There is a way to bypass allowFunctions that will affect the security of the application. When the template is set to allow/disallow the use of certain functions, adding control characters (x00-x08) after the function will bypass these restrictions.
- Record
UBUNTU-CVE-2021-23803- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
latte/lattePackagist |
before 2.10.6 | 2.10.6 |
latte/lattePackagist |
before 2.10.6, plus listed versions v2.10.1v2.10.2v2.10.3v2.10.4v2.10.5 Show 45 moreShow lessv2.2.0v2.2.1v2.2.2v2.2.3v2.2.4v2.2.5v2.2.6v2.2.7v2.2.8v2.2.9v2.3.0v2.3.1v2.3.10v2.3.11v2.3.12v2.3.13v2.3.2v2.3.3v2.3.4v2.3.5v2.3.6v2.3.7v2.3.8v2.3.9v2.4.0v2.4.1v2.4.2v2.4.3v2.4.4v2.4.5v2.4.6v2.4.7v2.4.8v2.4.9v2.5.0v2.5.1v2.5.2v2.5.3v2.5.4v2.5.5v2.5.6v2.5.7v2.6.0v2.6.1v2.6.2 |
2.10.6 |
php-netteUbuntu:Pro:16.04:LTS |
All versions, plus listed versions 2.3.4-12.3.5-12.3.7-12.3.8-12.3.8-1ubuntu12.3.8-1ubuntu1+esm1 |
None known |
php-netteUbuntu:18.04:LTS |
All versions, plus listed versions 2.4-20160731-12.4-20160731-1ubuntu0.1 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-23803 is a critical vulnerability (CVSS 9.8) in Nette Latte, published December 17, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.63%, the 76th percentile. Fixed in latte/latte 2.10.6.
References
snyk.io/vuln/SNYK-PHP-LATTELATTE-1932226
github.com/nette/latte/issues/279
nvd.nist.gov/vuln/detail/CVE-2021-23803
ubuntu.com/security/CVE-2021-23803
cve.org/CVERecord?id=CVE-2021-23803
Left out here: 23 versions. The JSON record has them.