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High, CVSS 7.3amended

@saltcorn/server Remote Code Execution (RCE) / SQL injection via prototype pollution by manipulating lang and defstring parameters when setting localizer strings

GHSA-78p3-fwcq-62c2

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (@saltcorn/server 1.0.0-beta.14), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
7.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P · score source
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

Summary The endpoint /site-structure/localizer/save-string/:lang/:defstring accepts two parameter values: lang and defstring. These values are used in an unsafe way to set the keys and value of the cfgStrings object. It allows to add/modify properties of the Object prototype that result in several logic issues, including: - RCE vulnerabilities by polluting the tempRootFolder property - SQL injection vulnerabilities by polluting the schema property when using PostgreSQL database. Details - file: https://github.com/saltcorn/saltcorn/blob/v1.0.0-beta.13/packages/server/routes/infoarch.js#L236-L239 PoC Setup: - set SALTCORNNWORKERS=1 before starting the saltcorn server (to easily observe the behavior of the PoC) - make sure to use PostgresSQL backend - login with a user with admin permission RCE This PoC demonstrates how to escalate the Prototype Pollution vulnerability to change the behavior of certain command executed. - check that the file that will be created does not exists: -…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-78p3-fwcq-62c2

  2. Revision 2 · amended ·

    Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

  3. Revision 1 · created ·

    Published from osv record GHSA-78p3-fwcq-62c2

Agent brief

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# Patch Next advisory brief: GHSA-78p3-fwcq-62c2

Advisory: @saltcorn/server Remote Code Execution (RCE) / SQL injection via prototype pollution by manipulating `lang` and `defstring` parameters when setting localizer strings
IDs: GHSA-78p3-fwcq-62c2
Record: https://patchnext.com/advisories/ghsa-78p3-fwcq-62c2 (revision 3, source checked 26 Oct 2026, 12:31 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @saltcorn/server 1.0.0-beta.14. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @saltcorn/server: affected <= 1.0.0-beta.13; fixed in 1.0.0-beta.14

## Suggested inspection (read-only)
- `npm ls @saltcorn/server --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @saltcorn/server.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-78p3-fwcq-62c2 (OSV record GHSA-78p3-fwcq-62c2 lists affected ranges: npm @saltcorn/server >=0 <1.0.0-beta.14 (fixed))
- Verified: https://github.com/advisories/GHSA-78p3-fwcq-62c2 (GitHub-reviewed advisory GHSA-78p3-fwcq-62c2 lists affected ranges: npm @saltcorn/server >=0 <=1.0.0-beta.13)

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