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CVE-2023-6426· NVD / CVE Program· CNA INCIBE

Cross-site Scripting vulnerability in BigProf products

A vulnerability has been discovered in BigProf Online Invoicing System 2.6, which does not sufficiently encode user-controlled input, resulting in persistent XSS through /invoicing/app/invoices_view.php, in the FirstRecord parameter. Exploitation of this vulnerability could allow an attacking user to store dangerous JavaScript payloads on the system that will be triggered when the page loads.

MediumCVSS 5.4 · v3.1—No exploit No fix recorded
Published
Nov 30, 2023
Updated
Jun 17, 2026
EPSS
0.4% · 30th percentile
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Report tools

JSON

Action score

21

Monitor

Low priority for now.

CVSS
21 / 40 · 5.4 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CNA vs NVD score

NVD
5.4
CNA · INCIBE
6.3
0.9 point gap

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
bigprofonline invoicing system

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • bigprof online invoicing system2.6

Versions reported by the vendor

Affected version ranges reported by the assigning authority (INCIBE). Independent of NVD's CPE analysis and usually ahead of it.

  • BigProf Online Invoicing System

    • 2.6affected

Same product

bigprof: all records

Other highest-scoring records for the same primary product.

  • CVE-2020-35674BigProf Online Invoicing System before 2.9 suffers from an unauthenticated SQL Injection found in /membership_passwordReset.php (the endpoin
    39Monitor
  • CVE-2020-35675BigProf Online Invoicing System before 3.0 offers a functionality that allows an administrator to move the records of members across groups.
    35Monitor
  • CVE-2020-35676BigProf Online Invoicing System before 3.1 fails to correctly sanitize an XSS payload when a user registers using the self-registration func
    24Monitor
  • CVE-2020-6583BigProf Online Invoicing System (OIS) through 2.6 has XSS that can be leveraged for session hijacking.
    24Monitor
  • CVE-2023-6435Cross-site Scripting vulnerability in BigProf products
    21Monitor
  • CVE-2023-6434Cross-site Scripting vulnerability in BigProf products
    21Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2023-64270 days apartCross-site Scripting vulnerability in BigProf products
    21Monitor
  • CVE-2023-64280 days apartCross-site Scripting vulnerability in BigProf products
    21Monitor
  • CVE-2023-64290 days apartCross-site Scripting vulnerability in BigProf products
    21Monitor
  • CVE-2023-64330 days apartCross-site Scripting vulnerability in BigProf products
    21Monitor
  • CVE-2023-64340 days apartCross-site Scripting vulnerability in BigProf products
    21Monitor
  • CVE-2023-64350 days apartCross-site Scripting vulnerability in BigProf products
    21Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
low · data or configuration can be modified
Availability
none

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
Required
Scope
Changed
Confidentiality impact
Low
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

nvd-primary

Root cause

User content is inserted into the page as HTML. The browser interprets the content as code rather than data.

The bug in code

The whole CWE-79 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
commentEl.innerHTML = comment.body;

Fixed

ts
commentEl.textContent = comment.body;

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records