CVE-2023-33187
highlight vulnerable to cleartext transmission of sensitive information
Highlight is an open source, full-stack monitoring platform. Highlight may record passwords on customer deployments when a password html input is switched to type="text" via a javascript "Show Password" button. This differs from the expected behavior which always obfuscates type="password" inputs. A customer may assume that switching to type="text" would also not record this input; hence, they would not add additional highlight-mask css-class obfuscation to this part of the DOM, resulting in unintentional recording of a password value when a Show Password button is used. This issue was patched in version 6.0.0.
This patch tracks changes to the type attribute of an input to ensure an input that used to be a type="password" continues to be obfuscated.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- High
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
highlight vulnerable to cleartext transmission of sensitive information
Highlight is an open source, full-stack monitoring platform. Highlight may record passwords on customer deployments when a password html input is switched to type="text" via a javascript "Show Password" button. This differs from the expected behavior which always obfuscates type="password" inputs. A customer may assume that switching to type="text" would also not record this input; hence, they would not add additional highlight-mask css-class obfuscation to this part of the DOM, resulting in unintentional recording of a password value when a Show Password button is used. This issue was patched in version 6.0.0.
This patch tracks changes to the type attribute of an input to ensure an input that used to be a type="password" continues to be obfuscated.
- Record
CVE-2023-33187- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:N/A:N - Weakness
- CWE-319
- Updated
- 2026-11-02
EUVDEUVD-2023-1518
Highlight is an open source, full-stack monitoring platform. Highlight may record passwords on customer deployments when a password html input is switched to type="text" via a javascript "Show Password" button. This differs from the expected behavior which always obfuscates type="password" inputs. A customer may assume that switching to type="text" would also not record this input; hence, they would not add additional highlight-mask css-class obfuscation to this part of the DOM, resulting in unintentional recording of a password value when a Show Password button is used. This issue was patched in version 6.0.0.
This patch tracks changes to the type attribute of an input to ensure an input that used to be a type="password" continues to be obfuscated.
- Record
EUVD-2023-1518- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:N/A:N - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-9qpj-qq2r-5mcc
html inputs of type password recorded in plaintext when converted to text inputs
Impact
Highlight may record passwords on customer deployments when a password html input is switched to type="text" via a javascript "Show Password" button. This differs from the expected behavior which always obfuscates type="password" inputs. A customer may assume that switching to type="text" would also not record this input; hence, they would not add additional highlight-mask css-class obfuscation to this part of the DOM, resulting in unintentional recording of a password value when a Show Password button is used.
Patches
[email protected] resolves the issue via https://github.com/rrweb-io/rrweb/pull/1184
This patch tracks changes to the type attribute of an input to ensure an input that used to be a type="password" continues to be obfuscated.
Workarounds
We have deployed a change to our data ingest to obfuscate passwords server side from older clients. This means that upgrading to the latest version of highlight.run is not necessary but recommended to prevent potential network transfer of recorded password data to our backend.
References
- Record
GHSA-9qpj-qq2r-5mcc- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:N/A:N - Weakness
- CWE-319
- Updated
- 2026-11-02
NVD
Highlight is an open source, full-stack monitoring platform. Highlight may record passwords on customer deployments when a password html input is switched to type="text" via a javascript "Show Password" button. This differs from the expected behavior which always obfuscates type="password" inputs. A customer may assume that switching to type="text" would also not record this input; hence, they would not add additional highlight-mask css-class obfuscation to this part of the DOM, resulting in unintentional recording of a password value when a Show Password button is used. This issue was patched in version 6.0.0.
This patch tracks changes to the type attribute of an input to ensure an input that used to be a type="password" continues to be obfuscated.
- Record
CVE-2023-33187- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:N/A:N - CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-319
- Updated
- 2026-11-02
OSVAZL-36943
CVE-2023-33187 affecting package highlight 4.18-1
Highlight is an open source, full-stack monitoring platform. Highlight may record passwords on customer deployments when a password html input is switched to type="text" via a javascript "Show Password" button. This differs from the expected behavior which always obfuscates type="password" inputs. A customer may assume that switching to type="text" would also not record this input; hence, they would not add additional highlight-mask css-class obfuscation to this part of the DOM, resulting in unintentional recording of a password value when a Show Password button is used. This issue was patched in version 6.0.0.
This patch tracks changes to the type attribute of an input to ensure an input that used to be a type="password" continues to be obfuscated.
- Record
AZL-36943- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-05
OSVGHSA-9qpj-qq2r-5mcc
html inputs of type password recorded in plaintext when converted to text inputs
Impact
Highlight may record passwords on customer deployments when a password html input is switched to type="text" via a javascript "Show Password" button. This differs from the expected behavior which always obfuscates type="password" inputs. A customer may assume that switching to type="text" would also not record this input; hence, they would not add additional highlight-mask css-class obfuscation to this part of the DOM, resulting in unintentional recording of a password value when a Show Password button is used.
Patches
[email protected] resolves the issue via https://github.com/rrweb-io/rrweb/pull/1184
This patch tracks changes to the type attribute of an input to ensure an input that used to be a type="password" continues to be obfuscated.
Workarounds
We have deployed a change to our data ingest to obfuscate passwords server side from older clients. This means that upgrading to the latest version of highlight.run is not necessary but recommended to prevent potential network transfer of recorded password data to our backend.
References
- Record
GHSA-9qpj-qq2r-5mcc- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:N/A:N - Weakness
- CWE-319
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
highlight.runnpm |
before 6.0.0 | 6.0.0 |
highlightAzure Linux:3 |
through 4.18-1 | None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | OSV | |
| aliases, products | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2023-33187 is a medium vulnerability (CVSS 5.4) in Dn88 Highlight, published May 26, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.29%, the 21st percentile. Fixed in highlight.run 6.0.0.